Rapid, parallel identification of cell lines

ABSTRACT

Host cells that exhibit regulated expression of a test gene, are rapidly identifyed by providing a plurality of host cells, each host cell comprising a polynucleotide, the polynucleotide comprising in order a regulatable promoter; a test gene; an IRES sequence; and a surface marker coding sequence, where the surface marker comprises a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker; inducing said promoter; and selecting a host cell that displays said surface marker on its surface.

FIELD OF THE INVENTION

[0001] This invention is related generally to the fields of molecular biology and genomics. More particularly, the invention relates to nucleic acid vectors and methods for rapidly identifying transformed cells with regulated expression of a heterologous polynucleotide.

BACKGROUND OF THE INVENTION

[0002] Identification of clonal eukaryotic cells lines that have regulated expression of target cDNAs or genes has been a time consuming and expensive process. During the course of cell biological and functional genomic investigations it is often desirable to create cell lines in which a cDNA is expressed in a regulated manner. For this purpose many types of regulons (combinations of transactivators and regulated promoters) have been invented. These include the tetracycline regulon (U. Baron, et al., Nuc Acids Res (1995) 23(17):3605-06), the ecdysone regulon (D. No, et al., Proc Natl Acad Sci USA (1996) 93(8):3346-51), regulons controlled by a transplanted E. coli Lac/La repressor system, the heat shock regulon, and the metalothionine regulon. These systems provide, with some effort, clonal cell lines in which the cDNA is regulated by application of an exogenous stimulator: tetracycline, ecdysone, isopropylthiogal-actopyranoside (ITGP), heat or heavy metals, respectively. The time and expense of creating these cells lines arises from the need to isolate and expand numerous single cell clones and analyze each clone for appropriate regulation of the query gene. If a way could be devised to use a rapid cell sorting technique such as flow cytometry, cell panning, colorimetric overlays or magnetic selection to identify candidate regulated clones, significant time and effort could be saved.

SUMMARY OF THE INVENTION

[0003] We have now invented a construct and method for rapidly labeling host cells, and for determining which cells provide regulated expression of a test gene (and surface label).

[0004] One aspect of the invention is a polynucleotide, comprising a regulatable promoter; a test gene; an IRES sequence; a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker.

[0005] Another aspect of the invention is a host cell, comprising: a polynucleotide, said polynucleotide comprising a regulatable promoter, a test gene, an IRES sequence, a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker.

[0006] Another aspect of the invention is a method of identifying a host cell that exhibits regulated expression of a test gene, comprising: providing a plurality of host cells, each host cell comprising a polynucleotide, said polynucleotide comprising in order a regulatable promoter; a test gene; an IRES sequence; and a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker; inducing said promoter; and selecting a host cell that displays said surface marker on its surface.

[0007] Another aspect of the invention is a method of identifying a host cell that exhibits regulated expression of a test gene, comprising: providing a plurality of host cells, each host cell comprising a polynucleotide, said polynucleotide comprising in order a regulatable promoter; a test gene; an IRES sequence; and a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker; selecting a plurality of host cells that do not exhibit said surface marker in the absence of induction of said promoter; inducing said promoter; and selecting a host cell that exhibits expression of said surface marker.

BRIEF DESCRIPTION OF THE FIGURES

[0008]FIG. 1 is a diagram of an embodiment of the invention (the pFastFind vector, SEQ ID NO:5).

[0009]FIG. 2 is a diagram of the pFastFind-delta vector (SEQ ID NO:6), a version having a reduced size surface epitope marker.

[0010]FIG. 3 is a diagram of the pFastFind-point vector (SEQ ID NO:7), a version with a point mutation that eliminates the alkaline phosphatase enzymatic activity from the surface epitope marker while maintaining the size and epitope characteristics.

[0011]FIG. 4 is a summary protocol for isolation of regulated expression clones using vectors of the invention.

[0012]FIG. 5 presents data demonstrating that pFastFind results in the preparation of cell lines with regulated expression that persists for 36 hours after ponasterone-A treatment, and is induced by micromolar concentrations of ponasterone-A.

[0013]FIG. 6 presents data demonstrating that the surrogate marker expression correlates with the amount of mRNA encoding the query gene.

DETAILED DESCRIPTION

[0014] Definitions:

[0015] The terms “test gene” and “query gene” refer to a polynucleotide to be examined, whether its function is known or unknown, regardless of whether it is synthetic or identical to a known sequence.

[0016] The term “IRES” refers to an internal ribosome binding site, or other sequence capable of serving as a translational initiation point when transcribed into mRNA.

[0017] The term “surface marker” refers to a protein which is associated with the surface of a host cell following translation. In general, the surface marker must be detectable either directly or through binding a labeled binding partner.

[0018] The term “regulatable promoter” refers to a polynucleotide sequence capable of controlling the transcription of an adjacent polynucleotide, and which can be controlled by altering or adjusting the host cell's environment. The environment can be adjusted by addition or subtraction of various factors or compounds, by altering the temperature, pressure, concentration of media components, radiation, and the like.

[0019] The term “FACS” refers to fluorescence-activated cell sorting, and includes any method for separating cells on the basis of a visible or fluorescent label. The label can be attached directly to the cell (for example, it can be expressed as a cell surface protein), or can be bound to the cell surface (for example, by allowing a labeled antibody to recognize and bind to a cell surface antigen).

[0020] General Method:

[0021] The vector of the invention and its method of use allows rapid isolation of candidate eukaryotic cell clones in which a query gene is regulated by exogenous application of an appropriate stimulus. The vector is arranged such that the query gene can be cloned immediately downstream of the regulated promoter by means of a multiple cloning site (MCS). Downstream of the multiple cloning site is placed an internal ribosome entry site (IRES); and downstream of the IRES is placed a cell membrane-localized protein for which an epitope recognized by a convenient antibody is available (a surrogate surface marker). Thus, since the surface epitope is co-cistronic with the query gene, both the query gene and the surface epitope will be elevated in response to the exogenous stimulator.

[0022] The use of a surrogate surface marker for the query gene allows isolation of clonal cell lines with stimulator-induced expression by means of flow cytometry, magnetic cell sorting, cell panning, cell enrichment by column chromatography, by use of colorimetric cell overlay methods, and other cell enrichment techniques. The use of a surrogate surface marker for the query gene circumvents any need for a specific antibody to the query gene's encoded protein, it circumvents any need for a biochemical assay for the query gene's product. The surrogate surface marker allows rapid reconfirmation of the regulation and expression of the query gene by use of the above mentioned techniques.

[0023] Suitable surrogate surface markers include, without limitation, placental alkaline phosphatase, β-lactamase, β2-microglobulin, and the like. If desired, one can select or construct any distinct surface protein, and prepare antibodies capable of recognizing the protein by conventional methods. The polynucleotide encoding the surface marker preferably further includes a secretion signal sequence (or other sequence that provides for export of the protein to the outer surface of the cell), and a transmembrane anchor (or other sequence that insures that the protein will remain associated with the cell surface). The surface marker is preferably relatively non-toxic to the cell. The surface marker can exhibit enzymatic activity, which can be used as a label (for example, alkaline phosphatase, β-galactosidase, and the like), or can have rely solely on binding (for example, as an epitope or ligand-binding partner), or can include both enzymatic and ligand-binding features.

[0024] The presence of a surface marker permits one to quickly separate host cells that express the test gene (and thus the surface marker) from those that do not. Such separation can be effected by means of FACS (fluorescence-activated cell sorting), affinity panning, affinity column separation, and the like. Thus, one can identify host cells that express the test gene without the need to identify another phenotype or altered characteristic that results from the test gene expression. Further, one can separate host cells in which expression is regulated from cells in which expression is either constitutive or non-existent, by selecting cells that do not express the surface marker when the promoter is repressed or not induced, and from that pool selecting cells that express the marker following induction of the promoter. These cells can also be removed by using an antibody specific for the surface marker in combination with complement. It is also possible to perform the selection steps in reverse order, or to repeat the steps several times, although one may need to wait a sufficient period of time for marker present on the host cell surface to be cleared. Additionally, one can select several different pools of cells by using different methods for inducing the promoters, for example, where the vector is cloned into position adjacent to a plurality of different promoters, or next to promoters randomly. For example, one can select a pool of cells that do not express the surface marker constitutively, and from this pool select a subset of cells that express the surface marker in response to a change in temperature. The cells that were not selected can be subjected to other conditions, for example the presence or absence of a nutrient, and any cells that respond to such conditions are then selected.

[0025] The table below illustrates the advantages of the method of the invention over conventional procedures. Conventional pFastFind Cell Cloning Technology Method Time Elapsed 35 days 30 days Manpower 14 days  5 days Screening method on clonal cell lines RT-PCR FACS Number of clones analyzed 21 23 Number of regulated clones 1 10 Cloning efficiency 4.8% 43.5%

[0026]FIG. 1 is a schematic view of an embodiment of the invention (the pFastFind vector, SEQ ID NO:5). It highlights the neomycin resistance gene (herring-bone), the ecdysone inducible promoter (vertical hatching), the multiple cloning site (“MCS”) (grid), internal ribosome initiation sequence (IRES) (diagonal hatching), polyadenylation sequence (check hatching), secretion signal sequence (stippled hatching), surface marker alkaline phosphatase (horizontal hatching), and the transmembrane region from the PDEF receptor (brick pattern). The “M” indicates a methionine start site for translation of the surface marker, and the stop sign indicates the stop sequence for translation of the surface marker. the target cDNA or query gene is inserted in the MCS.

[0027]FIG. 2 is a schematic view of another embodiment of the invention (the pFastFind-delta vector, SEQ ID NO:6). Its highlighted features are depicted as in FIG. 1. The deletion of residues 98-260 of the surface marker is shown as a white box.

[0028]FIG. 3 is a schematic view of another embodiment of the invention (the pFastFind-point vector, SEQ ID NO:7). Its highlighted features are depicted as in FIG. 1. S→A indicates the point mutation that eliminates the catalytic activity of the alkaline phosphatase surface marker.

EXAMPLES

[0029] The following examples are provided as a guide for the practitioner of ordinary skill in the art. Nothing in the examples is intended to limit the claimed invention. Unless otherwise specified, all reagents are used in accordance with the manufacturer's recommendations, and all reactions are performed at standard temperature and pressure.

Example 1 pFastFind-JNK3

[0030] (A) Construction of Vector pFastFind-JNK3

[0031] 1. Building pIND-IRES: The following oligonucleotides were used to PCR amplify the IRES sequence from pIRES-EYFP (Clontech):

[0032] 5′TCATCATCATCTCGAGCCAATTCCGCCCCTCTCCCTC (SEQ ID NO:1);

[0033] 5′TCTCTCTAGACCGGGTTGTGGCAAGCTTATCATC (SEQ ID NO:2).

[0034] The resulting IRES cDNA was digested with XhoI and XbaI and ligated to pIND (Invitrogen) treated with XhoI and XbaI and calf intestine phosphatase (CIP). The ligated plasmid was transformed and pIND-IRES was isolated and verified by restriction digests.

[0035] 2. Building pIND-IRES-SEAP: Full length secreted alkaline phosphatase (SEAP) cDNA was amplified from pSEAPBasic2 (Clontech) using primers containing NheI at the 5′ end and XbaI at the 3′ end. The resulting SEAP cDNA was digested with NheI and XbaI and ligated to pIND-IRES treated with XbaI and CIP. The ligated plasmid was transformed and pIND-IRES-SEAP was isolated and verified by restriction digests.

[0036] 3. Building pIND-IRES/SEAP-TM (pFastFind): The following oligos were used to amplify the TM fragment from pDisplay (Invitrogen):

[0037] 5′CTCTAGTCTAGAGTCGGGGCGGCCGGCCGCTTCGAGCAGACATCTCCCGGGAATCGCGGCTGCAG (SEQ ID NO:3);

[0038] 5′TAGCTAGCTGATCTCGAGCGGCCGCCTGAACGT (SEQ ID NO:4).

[0039] The resulting TM PCR product was topo cloned into pcDNA3.1 and isolated by digestion with XbaI and NheI. The XbaI-TM-NheI fragment was ligated to pIND-IRES/SEAP treated with XbaI and CIP. The ligated plasmid was transformed and pIND-IRES/SEAP-TM was isolated and verified by restriction digests.

[0040] 4. Building pFastFind-JNK3: pFastFind-JNK3 (SEQ ID NO:8) was constructed by inserting the protein coding sequence of JNK3 into pFastFind. The JNK3 sequence was isolated using polymerase chain reactions (Stratagene) from a human brain cDNA library using primers that encode a mammalian translation consensus sequence and the coding sequence surrounding the initiator methionine and stop codons of JNK3 (Genbank Accession number U07620). The PCR product was first subcloned into pIND, amplified by PCR, inserted into pcDNA2.1-TOPO and then subcloned in between SpeI and EcoRV restriction sites of pFastFind. The DNA sequence of the pFastFind-JNK3 vector was determined throughout the JNK3 coding region. The protein sequence of the JNK3 clone agreed with the consensus alignment of JNK3 clones present in Genbank with the exception of the following changes: Tyr to Cys at residue 240.

[0041] (B) Use of pFastFind-JNK3 to Isolate Clonal Cell Lines with Regulated Expression of JNK3

[0042] JNK3 is a member of the MAP kinase family of protein kinases. JNK3 shares sequence homology and common biochemical substrates with its close relative JNK1 (an important regulator of early response genes); however, its role in cell physiology is unclear. An understanding of JNK3 role in cell physiology is of immediate interest. To study this gene, we constructed a cell line in which JNK3's expression and activity could be regulated by the application of an exogenous agent that is inert to the engineered cell line.

[0043] Cell lines were isolated using either of two protocols. Protocol A (48-58 days) comprised: (a) transfecting cells with pFastFind; (b) selecting the transformed cells with neomycin for 15 days; (c) adding ponasterone A for 1 day; (d) isolating single cells displaying the surface marker by FACS; (e) allowing the single cells to multiply for 30-40 days; and (f) analyzing single clones treated with and without ponasterone A by FACS. Protocol B (59-79 days) comprised: (a) transfecting cells with pFastFind; (b) selecting the transformed cells with neomycin for 15 days; (c) adding ponasterone A for 1 day; (d) isolating an enriched pool of single cells displaying the surface marker by FACS; (e) allowing the single cells to multiply for 10-20 days; (f) adding ponasterone A for 1 day; (g) isolating single surface-marker positive cells using FACS; (h) allowing the single cells to multiply for 30-40 days; and (i) analyzing single clones treated with and without ponasterone A by FACS.

[0044] The pFastFind-JNK3 vector was transfected into ECR-293 cells (Invitrogen), and treated with neomycin for 15 days. Surviving cells were treated with 5 μM ponasterone A and rendered into single cell suspension by trypsinization. The cell suspension was incubated with anti-SEAP monoclonal antibody for 1 hour at room temperature and subsequently incubated with fluorescein-conjugated anti-mouse IgG for 30 minutes at room temperature in dark. The labeled cell suspension was resuspended into phosphate buffered saline containing 5 μg/ml of propidium iodide and analyzed for fluorescein fluorescence using CellQuest software on FACSVantageSE (Becton Dickinson). Cells with fluorescein fluorescence>20-30 and propidium iodide fluorescence<100 were gated and collected as population or single cell clones using CloneCyt software.

[0045] Single cells were expanded and then re-analyzed using FACS for their expression of the surface marker after treatment with ponasterone A for 24-48 h. Cells showing increased expression of the surface marker in the presence of ponasterone A as compared to unstained controls were analyzed at varying times (0-48 h) after the start of ponasterone A treatment and were subjected to increasing doses (0-30 μM) of ponasterone A. FIG. 6 shows one clone as an example where the expression of the surface marker is significantly increased with time after the addition of ponasterone A as well as with increasing concentrations of ponasterone A. Cell clones showing increased expression of the surfaces marker were also analyzed using semi-quantitative RT-PCR with primers specific for the query gene (JNK 3). FIG. 7 shows an example where the expression of the query gene increases in a similar fashion as the expression of the surface marker after the addition of ponasterone A. This shows that the methods described here can lead to a rapid selection of cell clones regulating the expression of the query gene.

1 8 1 37 DNA PCR primer 1 tcatcatcat ctcgagccaa ttccgcccct ctccctc 37 2 34 DNA PCR primer 2 tctctctaga ccgggttgtg gcaagcttat catc 34 3 65 DNA PCR primer 3 ctctagtcta gagtcggggc ggccggccgc ttcgagcaga catctcccgg gaatcgcggc 60 tgcag 65 4 33 DNA PCR primer 4 tagctagctg atctcgagcg gccgcctgaa cgt 33 5 7563 DNA pFastFind 5 agatctcggc cgcatattaa gtgcattgtt ctcgataccg ctaagtgcat tgttctcgtt 60 agctcgatgg acaagtgcat tgttctcttg ctgaaagctc gatggacaag tgcattgttc 120 tcttgctgaa agctcgatgg acaagtgcat tgttctcttg ctgaaagctc agtacccggg 180 agtaccctcg accgccggag tataaataga ggcgcttcgt ctacggagcg acaattcaat 240 tcaaacaagc aaagtgaaca cgtcgctaag cgaaagctaa gcaaataaac aagcgcagct 300 gaacaagcta aacaatctgc agtaaagtgc aagttaaagt gaatcaatta aaagtaacca 360 gcaaccaagt aaatcaactg caactactga aatctgccaa gaagtaatta ttgaatacaa 420 gaagagaact ctgaatactt tcaacaagtt accgagaaag aagaactcac acacagctag 480 cgtttaaact taagcttggt accgagctcg gatccactag tccagtgtgg tggaattctg 540 cagatatcca gcacagtggc ggccgctcga gccaattccg cccctctccc tccccccccc 600 ctaacgttac tggccgaagc cgcttggaat aaggccggtg tgcgtttgtc tatatgtgat 660 tttccaccat attgccgtct tttggcaatg tgagggcccg gaaacctggc cctgtcttct 720 tgacgagcat tcctaggggt ctttcccctc tcgccaaagg aatgcaaggt ctgttgaatg 780 tcgtgaagga agcagttcct ctggaagctt cttgaagaca aacaacgtct gtagcgaccc 840 tttgcaggca gcggaacccc ccacctggcg acaggtgcct ctgcggccaa aagccacgtg 900 tataagatac acctgcaaag gcggcacaac cccagtgcca cgttgtgagt tggatagttg 960 tggaaagagt caaatggctc tcctcaagcg tattcaacaa ggggctgaag gatgcccaga 1020 aggtacccca ttgtatggga tctgatctgg ggcctcggtg cacatgcttt acatgtgttt 1080 agtcgaggtt aaaaaaacgt ctaggccccc cgaaccacgg ggacgtggtt ttcctttgaa 1140 aaacacgatg ataagcttgc cacaacccgg tctagcccgg gctcgagatc tgcgatctaa 1200 gtaagcttcg aatcgcgaat tcgcccacca tgctgctgct gctgctgctg ctgggcctga 1260 ggctacagct ctccctgggc atcatcccag ttgaggagga gaacccggac ttctggaacc 1320 gcgaggcagc cgaggccctg ggtgccgcca agaagctgca gcctgcacag acagccgcca 1380 agaacctcat catcttcctg ggcgatggga tgggggtgtc tacggtgaca gctgccagga 1440 tcctaaaagg gcagaagaag gacaaactgg ggcctgagat acccctggcc atggaccgct 1500 tcccatatgt ggctctgtcc aagacataca atgtagacaa acatgtgcca gacagtggag 1560 ccacagccac ggcctacctg tgcggggtca agggcaactt ccagaccatt ggcttgagtg 1620 cagccgcccg ctttaaccag tgcaacacga cacgcggcaa cgaggtcatc tccgtgatga 1680 atcgggccaa gaaagcaggg aagtcagtgg gagtggtaac caccacacga gtgcagcacg 1740 cctcgccagc cggcacctac gcccacacgg tgaaccgcaa ctggtactcg gacgccgacg 1800 tgcctgcctc ggcccgccag gaggggtgcc aggacatcgc tacgcagctc atctccaaca 1860 tggacattga cgtgatccta ggtggaggcc gaaagtacat gtttcgcatg ggaaccccag 1920 accctgagta cccagatgac tacagccaag gtgggaccag gctggacggg aagaatctgg 1980 tgcaggaatg gctggcgaag cgccagggtg cccggtatgt gtggaaccgc actgagctca 2040 tgcaggcttc cctggacccg tctgtgaccc atctcatggg tctctttgag cctggagaca 2100 tgaaatacga gatccaccga gactccacac tggacccctc cctgatggag atgacagagg 2160 ctgccctgcg cctgctgagc aggaaccccc gcggcttctt cctcttcgtg gagggtggtc 2220 gcatcgacca tggtcatcat gaaagcaggg cttaccgggc actgactgag acgatcatgt 2280 tcgacgacgc cattgagagg gcgggccagc tcaccagcga ggaggacacg ctgagcctcg 2340 tcactgccga ccactcccac gtcttctcct tcggaggcta ccccctgcga gggagctcca 2400 tcttcgggct ggcccctggc aaggcccggg acaggaaggc ctacacggtc ctcctatacg 2460 gaaacggtcc aggctatgtg ctcaaggacg gcgcccggcc ggatgttacc gagagcgaga 2520 gcgggagccc cgagtatcgg cagcagtcag cagtgcccct ggacgaagag acccacgcag 2580 gcgaggacgt ggcggtgttc gcgcgcggcc cgcaggcgca cctggttcac ggcgtgcagg 2640 agcagacctt catagcgcac gtcatggcct tcgccgcctg cctggagccc tacaccgcct 2700 gcgacctggc gccccccgcc ggcaccaccg acgccgcgca cccgggttac tctagagtcg 2760 gggcggccgg ccgcttcgag cagacatctc ccgggaatcc gcggctgcag gtcgacgaac 2820 aaaaactcat ctcagaagag gatctgaatg ctgtgggcca ggacacgcag gaggtcatcg 2880 tggtgccaca ctccttgccc tttaaggtgg tggtgatctc agccatcctg gccctggtgg 2940 tgctcaccat catctccctt atcatcctca tcatgctttg gcagaagaag ccacgttagg 3000 cggccgctcg agatcagcta gagggcccgt ttaaacccgc tgatcagcct cgactgtgcc 3060 ttctagttgc cagccatctg ttgtttgccc ctcccccgtg ccttccttga ccctggaagg 3120 tgccactccc actgtccttt cctaataaaa tgaggaaatt gcatcgcatt gtctgagtag 3180 gtgtcattct attctggggg gtggggtggg gcaggacagc aagggggagg attgggaaga 3240 caatagcagg catgctgggg atgcggtggg ctctatggct tctgaggcgg aaagaaccag 3300 ctggggctct agggggtatc cccacgcgcc ctgtagcggc gcattaagcg cggcgggtgt 3360 ggtggttacg cgcagcgtga ccgctacact tgccagcgcc ctagcgcccg ctcctttcgc 3420 tttcttccct tcctttctcg ccacgttcgc cggctttccc cgtcaagctc taaatcgggg 3480 catcccttta gggttccgat ttagtgcttt acggcacctc gaccccaaaa aacttgatta 3540 gggtgatggt tcacgtagtg ggccatcgcc ctgatagacg gtttttcgcc ctttgacgtt 3600 ggagtccacg ttctttaata gtggactctt gttccaaact ggaacaacac tcaaccctat 3660 ctcggtctat tcttttgatt tataagggat tttggggatt tcggcctatt ggttaaaaaa 3720 tgagctgatt taacaaaaat ttaacgcgaa ttaattctgt ggaatgtgtg tcagttaggg 3780 tgtggaaagt ccccaggctc cccaggcagg cagaagtatg caaagcatgc atctcaatta 3840 gtcagcaacc aggtgtggaa agtccccagg ctccccagca ggcagaagta tgcaaagcat 3900 gcatctcaat tagtcagcaa ccatagtccc gcccctaact ccgcccatcc cgcccctaac 3960 tccgcccagt tccgcccatt ctccgcccca tggctgacta atttttttta tttatgcaga 4020 ggccgaggcc gcctctgcct ctgagctatt ccagaagtag tgaggaggct tttttggagg 4080 cctaggcttt tgcaaaaagc tcccgggagc ttgtatatcc attttcggat ctgatcaaga 4140 gacaggatga ggatcgtttc gcatgattga acaagatgga ttgcacgcag gttctccggc 4200 cgcttgggtg gagaggctat tcggctatga ctgggcacaa cagacaatcg gctgctctga 4260 tgccgccgtg ttccggctgt cagcgcaggg gcgcccggtt ctttttgtca agaccgacct 4320 gtccggtgcc ctgaatgaac tgcaggacga ggcagcgcgg ctatcgtggc tggccacgac 4380 gggcgttcct tgcgcagctg tgctcgacgt tgtcactgaa gcgggaaggg actggctgct 4440 attgggcgaa gtgccggggc aggatctcct gtcatctcac cttgctcctg ccgagaaagt 4500 atccatcatg gctgatgcaa tgcggcggct gcatacgctt gatccggcta cctgcccatt 4560 cgaccaccaa gcgaaacatc gcatcgagcg agcacgtact cggatggaag ccggtcttgt 4620 cgatcaggat gatctggacg aagagcatca ggggctcgcg ccagccgaac tgttcgccag 4680 gctcaaggcg cgcatgcccg acggcgagga tctcgtcgtg acccatggcg atgcctgctt 4740 gccgaatatc atggtggaaa atggccgctt ttctggattc atcgactgtg gccggctggg 4800 tgtggcggac cgctatcagg acatagcgtt ggctacccgt gatattgctg aagagcttgg 4860 cggcgaatgg gctgaccgct tcctcgtgct ttacggtatc gccgctcccg attcgcagcg 4920 catcgccttc tatcgccttc ttgacgagtt cttctgagcg ggactctggg gttcgaaatg 4980 accgaccaag cgacgcccaa cctgccatca cgagatttcg attccaccgc cgccttctat 5040 gaaaggttgg gcttcggaat cgttttccgg gacgccggct ggatgatcct ccagcgcggg 5100 gatctcatgc tggagttctt cgcccacccc aacttgttta ttgcagctta taatggttac 5160 aaataaagca atagcatcac aaatttcaca aataaagcat ttttttcact gcattctagt 5220 tgtggtttgt ccaaactcat caatgtatct tatcatgtct gtataccgtc gacctctagc 5280 tagagcttgg cgtaatcatg gtcatagctg tttcctgtgt gaaattgtta tccgctcaca 5340 attccacaca acatacgagc cggaagcata aagtgtaaag cctggggtgc ctaatgagtg 5400 agctaactca cattaattgc gttgcgctca ctgcccgctt tccagtcggg aaacctgtcg 5460 tgccagctgc attaatgaat cggccaacgc gcggggagag gcggtttgcg tattgggcgc 5520 tcttccgctt cctcgctcac tgactcgctg cgctcggtcg ttcggctgcg gcgagcggta 5580 tcagctcact caaaggcggt aatacggtta tccacagaat caggggataa cgcaggaaag 5640 aacatgtgag caaaaggcca gcaaaaggcc aggaaccgta aaaaggccgc gttgctggcg 5700 tttttccata ggctccgccc ccctgacgag catcacaaaa atcgacgctc aagtcagagg 5760 tggcgaaacc cgacaggact ataaagatac caggcgtttc cccctggaag ctccctcgtg 5820 cgctctcctg ttccgaccct gccgcttacc ggatacctgt ccgcctttct cccttcggga 5880 agcgtggcgc tttctcaatg ctcacgctgt aggtatctca gttcggtgta ggtcgttcgc 5940 tccaagctgg gctgtgtgca cgaacccccc gttcagcccg accgctgcgc cttatccggt 6000 aactatcgtc ttgagtccaa cccggtaaga cacgacttat cgccactggc agcagccact 6060 ggtaacagga ttagcagagc gaggtatgta ggcggtgcta cagagttctt gaagtggtgg 6120 cctaactacg gctacactag aaggacagta tttggtatct gcgctctgct gaagccagtt 6180 accttcggaa aaagagttgg tagctcttga tccggcaaac aaaccaccgc tggtagcggt 6240 ggtttttttg tttgcaagca gcagattacg cgcagaaaaa aaggatctca agaagatcct 6300 ttgatctttt ctacggggtc tgacgctcag tggaacgaaa actcacgtta agggattttg 6360 gtcatgagat tatcaaaaag gatcttcacc tagatccttt taaattaaaa atgaagtttt 6420 aaatcaatct aaagtatata tgagtaaact tggtctgaca gttaccaatg cttaatcagt 6480 gaggcaccta tctcagcgat ctgtctattt cgttcatcca tagttgcctg actccccgtc 6540 gtgtagataa ctacgatacg ggagggctta ccatctggcc ccagtgctgc aatgataccg 6600 cgagacccac gctcaccggc tccagattta tcagcaataa accagccagc cggaagggcc 6660 gagcgcagaa gtggtcctgc aactttatcc gcctccatcc agtctattaa ttgttgccgg 6720 gaagctagag taagtagttc gccagttaat agtttgcgca acgttgttgc cattgctaca 6780 ggcatcgtgg tgtcacgctc gtcgtttggt atggcttcat tcagctccgg ttcccaacga 6840 tcaaggcgag ttacatgatc ccccatgttg tgcaaaaaag cggttagctc cttcggtcct 6900 ccgatcgttg tcagaagtaa gttggccgca gtgttatcac tcatggttat ggcagcactg 6960 cataattctc ttactgtcat gccatccgta agatgctttt ctgtgactgg tgagtactca 7020 accaagtcat tctgagaata gtgtatgcgg cgaccgagtt gctcttgccc ggcgtcaata 7080 cgggataata ccgcgccaca tagcagaact ttaaaagtgc tcatcattgg aaaacgttct 7140 tcggggcgaa aactctcaag gatcttaccg ctgttgagat ccagttcgat gtaacccact 7200 cgtgcaccca actgatcttc agcatctttt actttcacca gcgtttctgg gtgagcaaaa 7260 acaggaaggc aaaatgccgc aaaaaaggga ataagggcga cacggaaatg ttgaatactc 7320 atactcttcc tttttcaata ttattgaagc atttatcagg gttattgtct catgagcgga 7380 tacatatttg aatgtattta gaaaaataaa caaatagggg ttccgcgcac atttccccga 7440 aaagtgccac ctgacgtcga cggatcgggc gcctatgtat aaacttacat aaatcttttt 7500 atttgtttat ccccaaggcg cgtgtaaagg ggcttttcac ggtggactgc agctgcctag 7560 ccc 7563 6 7469 DNA pFastFind-delta 6 agatctcggc cgcatattaa gtgcattgtt ctcgataccg ctaagtgcat tgttctcgtt 60 agctcgatgg acaagtgcat tgttctcttg ctgaaagctc gatggacaag tgcattgttc 120 tcttgctgaa agctcgatgg acaagtgcat tgttctcttg ctgaaagctc agtacccggg 180 agtaccctcg accgccggag tataaataga ggcgcttcgt ctacggagcg acaattcaat 240 tcaaacaagc aaagtgaaca cgtcgctaag cgaaagctaa gcaaataaac aagcgcagga 300 cttgttcgat ttgttagacg tcatttcacg ttcaatttca cttagttaat tttcattggt 360 cgttggttca tttagttgac gttgatgact ttagacggtt cttcattaat aacttatgtt 420 cttctcttga gacttatgaa agttgttgtt accgagaaag aagaactcac acacagctag 480 cgtttaaact taagcttggt accgagctcg gatccactag tccagtgtgg tggaattctg 540 cagatatcca gcacagtggc ggccgctcga gccaattccg cccctctccc tccccccccc 600 ctaacgttac tggccgaagc cgcttggaat aaggccggtg tgcgtttgtc tatatgtgat 660 tttccaccat attgccgtct tttggcaatg tgagggcccg gaaacctggc cctgtcttct 720 tgacgagcat tcctaggggt ctttcccctc tcgccaaagg aatgcaaggt ctgttgaatg 780 tcgtgaagga agcagttcct ctggaagctt cttgaagaca aacaacgtct gtagcgaccc 840 tttgcaggca gcggaacccc ccacctggcg acaggtgcct ctgcggccaa aagccacgtg 900 tataagatac acctgcaaag gcggcacaac cccagtgcca cgttgtgagt tggatagttg 960 tggaaagagt caaatggctc tcctcaagcg tattcaacaa ggggctgaag gatgcccaga 1020 aggtacccca ttgtatggga tctgatctgg ggcctcggtg cacatgcttt acatgtgttt 1080 agtcgaggtt aaaaaaacgt ctaggccccc cgaaccacgg ggacgtggtt ttcctttgaa 1140 aaacacgatg ataagcttgc cacaacccgg tctagcccgg gctcgagatc tgcgatctaa 1200 gtaagcttcg aatcgcgaat tcgcccacca tgctgctgct gctgctgctg ctgggcctga 1260 ggctacagct ctccctgggc atcatcccag ttgaggagga gaacccggac ttctggaacc 1320 gcgaggcagc cgaggccctg ggtgccgcca agaagctgca gcctgcacag acagccgcca 1380 agaacctcat catcttcctg ggcgatggga tgggggtgtc tacggtgaca gctgccagga 1440 tcctaaaagg gcagaagaag gacaaactgg ggcctgagat acccctggcc atggaccgct 1500 tcccatatgt ggctctgtcc aagacataca atgtagacaa acatgtgcca gacgctggag 1560 ccacagccac ggcctacctg tgcggggtca agggcaactt ccagaccatt ggcttgagtg 1620 cagccgcccg ctttaaccag tgcaacacga cacgcggcaa cgaggtcatc tccgtgatga 1680 atcgggccaa gaaagcaggg aagtcagtgg gagtggtaac caccacacga gtgcagcacg 1740 cctcgccagc cggcacctac gcccacacgg tgaaccgcaa ctggtactcg gacgccgacg 1800 tgcctgcctc ggcccgccag gaggggtgcc aggacatcgc tacgcagctc atctccaaca 1860 tggacattga cgtgatccta ggtggaggcc gaaagtacat gtttcgcatg ggaaccccag 1920 accctgagta cccagatgac tacagccaag gtgggaccag gctggacggg aagaatctgg 1980 tgcaggaatg gctggcgaag cgccagggtg cccggtatgt gtggaaccgc actgagctca 2040 tgcaggcttc cctggacccg tctgtgaccc atctcatggg tctctttgag cctggagaca 2100 tgaaatacga gatccaccga gactccacac tggacccctc cctgatggag atgacagagg 2160 ctgccctgcg cctgctgagc aggaaccccc gcggcttctt cctcttcgtg gagggtggtc 2220 gcatcgacca tggtcatcat gaaagcaggg cttaccgggc actgactgag acgatcatgt 2280 tcgacgacgc cattgagagg gcgggccagc tcaccagcga ggaggacacg ctgagcctcg 2340 tcactgccga ccactcccac gtcttctcct tcggaggcta ccccctgcga gggagctcca 2400 tcttcgggct ggcccctggc aaggcccggg acaggaaggc ctacacggtc ctcctatacg 2460 gaaacggtcc aggctatgtg ctcaaggacg gcgcccggcc ggatgttacc gagagcgaga 2520 gcgggagccc cgagtatcgg cagcagtcag cagtgcccct ggacgaagag acccacgcag 2580 gcgaggacgt ggcggtgttc gcgcgcggcc cgcaggcgca cctggttcac ggcgtgcagg 2640 agcagacctt catagcgcac gtcatggcct tcgccgcctg cctggagccc tacaccgcct 2700 gcgacctggc gccccccgcc ggcaccaccg acgccgcgca cccgggttac tctagagtcg 2760 gggcggccgg ccgcttcgag cagacatctc ccgggaatcc gcggctgcag gtcgacgaac 2820 aaaaactcat ctcagaagag gatctgaatg ctgtgggcca ggacacgcag gaggtcatcg 2880 tggtgccaca ctccttgccc tttaaggtgg tggtgatctc agccatcctg gccctggtgg 2940 tgctcaccat catctccctt atcatcctca tcatgctttg gcagaagaag ccacgttagg 3000 cggccgctcg agatcagcta gagggcccgt ttaaacccgc tgatcagcct cgactgtgcc 3060 ttctagttgc cagccatctg ttgtttgccc ctcccccgtg ccttccttga ccctggaagg 3120 tgccactccc actgtccttt cctaataaaa tgaggaaatt gcatcgcatt gtctgagtag 3180 gtgtcattct attctggggg gtggggtggg gcaggacagc aagggggagg attgggaaga 3240 caatagcagg catgctgggg atgcggtggg ctctatggct tctgaggcgg aaagaaccag 3300 ctggggctct agggggtatc cccacgcgcc ctgtagcggc gcattaagcg cggcgggtgt 3360 ggtggttacg cgcagcgtga ccgctacact tgccagcgcc ctagcgcccg ctcctttcgc 3420 tttcttccct tcctttctcg ccacgttcgc cggctttccc cgtcaagctc taaatcgggg 3480 catcccttta gggttccgat ttagtgcttt acggcacctc gaccccaaaa aacttgatta 3540 gggtgatggt tcacgtagtg ggccatcgcc ctgatagacg gtttttcgcc ctttgacgtt 3600 ggagtccacg ttctttaata gtggactctt gttccaaact ggaacaacac tcaaccctat 3660 ctcggtctat tcttttgatt tataagggat tttggggatt tcggcctatt ggttaaaaaa 3720 tgagctgatt taacaaaaat ttaacgcgaa ttaattctgt ggaatgtgtg tcagttaggg 3780 tgtggaaagt ccccaggctc cccaggcagg cagaagtatg caaagcatgc atctcaatta 3840 gtcagcaacc aggtgtggaa agtccccagg ctccccagca ggcagaagta tgcaaagcat 3900 gcatctcaat tagtcagcaa ccatagtccc gcccctaact ccgcccatcc cgcccctaac 3960 tccgcccagt tccgcccatt ctccgcccca tggctgacta atttttttta tttatgcaga 4020 ggccgaggcc gcctctgcct ctgagctatt ccagaagtag tgaggaggct tttttggagg 4080 cctaggcttt tgcaaaaagc tcccgggagc ttgtatatcc attttcggat ctgatcaaga 4140 gacaggatga ggatcgtttc gcatgattga acaagatgga ttgcacgcag gttctccggc 4200 cgcttgggtg gagaggctat tcggctatga ctgggcacaa cagacaatcg gctgctctga 4260 tgccgccgtg ttccggctgt cagcgcaggg gcgcccggtt ctttttgtca agaccgacct 4320 gtccggtgcc ctgaatgaac tgcaggacga ggcagcgcgg ctatcgtggc tggccacgac 4380 gggcgttcct tgcgcagctg tgctcgacgt tgtcactgaa gcgggaaggg actggctgct 4440 attgggcgaa gtgccggggc aggatctcct gtcatctcac cttgctcctg ccgagaaagt 4500 atccatcatg gctgatgcaa tgcggcggct gcatacgctt gatccggcta cctgcccatt 4560 cgaccaccaa gcgaaacatc gcatcgagcg agcacgtact cggatggaag ccggtcttgt 4620 cgatcaggat gatctggacg aagagcatca ggggctcgcg ccagccgaac tgttcgccag 4680 gctcaaggcg cgcatgcccg acggcgagga tctcgtcgtg acccatggcg atgcctgctt 4740 gccgaatatc atggtggaaa atggccgctt ttctggattc atcgactgtg gccggctggg 4800 tgtggcggac cgctatcagg acatagcgtt ggctacccgt gatattgctg aagagcttgg 4860 cggcgaatgg gctgaccgct tcctcgtgct ttacggtatc gccgctcccg attcgcagcg 4920 catcgccttc tatcgccttc ttgacgagtt cttctgagcg ggactctggg gttcgaaatg 4980 accgaccaag cgacgcccaa cctgccatca cgagatttcg attccaccgc cgccttctat 5040 gaaaggttgg gcttcggaat cgttttccgg gacgccggct ggatgatcct ccagcgcggg 5100 gatctcatgc tggagttctt cgcccacccc aacttgttta ttgcagctta taatggttac 5160 aaataaagca atagcatcac aaatttcaca aataaagcat ttttttcact gcattctagt 5220 tgtggtttgt ccaaactcat caatgtatct tatcatgtct gtataccgtc gacctctagc 5280 tagagcttgg cgtaatcatg gtcatagctg tttcctgtgt gaaattgtta tccgctcaca 5340 attccacaca acatacgagc cggaagcata aagtgtaaag cctggggtgc ctaatgagtg 5400 agctaactca cattaattgc gttgcgctca ctgcccgctt tccagtcggg aaacctgtcg 5460 tgccagctgc attaatgaat cggccaacgc gcggggagag gcggtttgcg tattgggcgc 5520 tcttccgctt cctcgctcac tgactcgctg cgctcggtcg ttcggctgcg gcgagcggta 5580 tcagctcact caaaggcggt aatacggtta tccacagaat caggggataa cgcaggaaag 5640 aacatgtgag caaaaggcca gcaaaaggcc aggaaccgta aaaaggccgc gttgctggcg 5700 tttttccata ggctccgccc ccctgacgag catcacaaaa atcgacgctc aagtcagagg 5760 tggcgaaacc cgacaggact ataaagatac caggcgtttc cccctggaag ctccctcgtg 5820 cgctctcctg ttccgaccct gccgcttacc ggatacctgt ccgcctttct cccttcggga 5880 agcgtggcgc tttctcaatg ctcacgctgt aggtatctca gttcggtgta ggtcgttcgc 5940 tccaagctgg gctgtgtgca cgaacccccc gttcagcccg accgctgcgc cttatccggt 6000 aactatcgtc ttgagtccaa cccggtaaga cacgacttat cgccactggc agcagccact 6060 ggtaacagga ttagcagagc gaggtatgta ggcggtgcta cagagttctt gaagtggtgg 6120 cctaactacg gctacactag aaggacagta tttggtatct gcgctctgct gaagccagtt 6180 accttcggaa aaagagttgg tagctcttga tccggcaaac aaaccaccgc tggtagcggt 6240 ggtttttttg tttgcaagca gcagattacg cgcagaaaaa aaggatctca agaagatcct 6300 ttgatctttt ctacggggtc tgacgctcag tggaacgaaa actcacgtta agggattttg 6360 gtcatgagat tatcaaaaag gatcttcacc tagatccttt taaattaaaa atgaagtttt 6420 aaatcaatct aaagtatata tgagtaaact tggtctgaca gttaccaatg cttaatcagt 6480 gaggcaccta tctcagcgat ctgtctattt cgttcatcca tagttgcctg actccccgtc 6540 gtgtagataa ctacgatacg ggagggctta ccatctggcc ccagtgctgc aatgataccg 6600 cgagacccac gctcaccggc tccagattta tcagcaataa accagccagc cggaagggcc 6660 gagcgcagaa gtggtcctgc aactttatcc gcctccatcc agtctattaa ttgttgccgg 6720 gaagctagag taagtagttc gccagttaat agtttgcgca acgttgttgc cattgctaca 6780 ggcatcgtgg tgtcacgctc gtcgtttggt atggcttcat tcagctccgg ttcccaacga 6840 tcaaggcgag ttacatgatc ccccatgttg tgcaaaaaag cggttagctc cttcggtcct 6900 ccgatcgttg tcagaagtaa gttggccgca gtgttatcac tcatggttat ggcagcactg 6960 cataattctc ttactgtcat gccatccgta agatgctttt ctgtgactgg tgagtactca 7020 accaagtcat tctgagaata gtgtatgcgg cgaccgagtt gctcttgccc ggcgtcaata 7080 cgggataata ccgcgccaca tagcagaact ttaaaagtgc tcatcattgg aaaacgttct 7140 tcggggcgaa aactctcaag gatcttaccg ctgttgagat ccagttcgat gtaacccact 7200 cgtgcaccca actgatcttc agcatctttt actttcacca gcgtttctgg gtgagcaaaa 7260 acaggaaggc aaaatgccgc aaaaaaggga ataagggcga cacggaaatg ttgaatactc 7320 atactcttcc tttttcaata ttattgaagc atttatcagg gttattgtct catgagcgga 7380 tacatatttg aatgtattta gaaaaataaa caaatagggg ttccgcgcac atttccccga 7440 aaagtgccac ctgacgtcga cggatcggg 7469 7 6980 DNA pFastFind-point 7 agatctcggc cgcatattaa gtgcattgtt ctcgataccg ctaagtgcat tgttctcgtt 60 agctcgatgg acaagtgcat tgttctcttg ctgaaagctc gatggacaag tgcattgttc 120 tcttgctgaa agctcgatgg acaagtgcat tgttctcttg ctgaaagctc agtacccggg 180 agtaccctcg accgccggag tataaataga ggcgcttcgt ctacggagcg acaattcaat 240 tcaaacaagc aaagtgaaca cgtcgctaag cgaaagctaa gcaaataaac aagcgcagct 300 gaacaagcta aacaatctgc agtaaagtgc aagttaaagt gaatcaatta aaagtaacca 360 gcaaccaagt aaatcaactg caactactga aatctgccaa gaagtaatta ttgaatacaa 420 gaagagaact ctgaatactt tcaacaagtt accgagaaag aagaactcac acacagctag 480 cgtttaaact taagcttggt accgagctcg gatccactag tccagtgtgg tggaattctg 540 cagatatcca gcacagtggc ggccgctcga gccaattccg cccctctccc tccccccccc 600 ctaacgttac tggccgaagc cgcttggaat aaggccggtg tgcgtttgtc tatatgtgat 660 tttccaccat attgccgtct tttggcaatg tgagggcccg gaaacctggc cctgtcttct 720 tgacgagcat tcctaggggt ctttcccctc tcgccaaagg aatgcaaggt ctgttgaatg 780 tcgtgaagga agcagttcct ctggaagctt cttgaagaca aacaacgtct gtagcgaccc 840 tttgcaggca gcggaacccc ccacctggcg acaggtgcct ctgcggccaa aagccacgtg 900 tataagatac acctgcaaag gcggcacaac cccagtgcca cgttgtgagt tggatagttg 960 tggaaagagt caaatggctc tcctcaagcg tattcaacaa ggggctgaag gatgcccaga 1020 aggtacccca ttgtatggga tctgatctgg ggcctcggtg cacatgcttt acatgtgttt 1080 agtcgaggtt aaaaaaacgt ctaggccccc cgaaccacgg ggacgtggtt ttcctttgaa 1140 aaacacgatg ataagcttgc cacaacccgg tctagcccgg gctcgagatc tgcgatctaa 1200 gtaagcttcg aatcgcgaat tcgcccacca tgctgctgct gctgctgctg ctgggcctga 1260 ggctacagct ctccctgggc atcatcccag ttgaggagga gaacccggac ttctggaacc 1320 gcgaggcagc cgaggccctg ggtgccgcca agaagctgca gcctgcacag acagccgcca 1380 agaacctcat catcttcctg ggcgatggga tgggggtgtc tacggtgaca gctgccagga 1440 tcctaaaagg gcagaagaag gacaaactgg ggcctgagat acccctggcc atggaccgct 1500 tcccatatgt ggctctgtcc aagacataca atgtagacaa acatgtgcca gacagtggag 1560 ccacagccac ggcctacctg tgcggggtca agggcaactt ccagaccatt ggcttgagtg 1620 cagccgcccg ctttaaccag tgcaacacga cacgcggcaa cgaggtcatc tccgtgatga 1680 atcgggccaa gaaagcaggg gcgggcttct tcctcttcgt ggagggtggt cgcatcgacc 1740 atggtcatca tgaaagcagg gcttaccggg cactgactga gacgatcatg ttcgacgacg 1800 ccattgagag ggcgggccag ctcaccagcg aggaggacac gctgagcctc gtcactgccg 1860 accactccca cgtcttctcc ttcggaggct accccctgcg agggagctcc atcttcgggc 1920 tggcccctgg caaggcccgg gacaggaagg cctacacggt cctcctatac ggaaacggtc 1980 caggctatgt gctcaaggac ggcgcccggc cggatgttac cgagagcgag agcgggagcc 2040 ccgagtatcg gcagcagtca gcagtgcccc tggacgaaga gacccacgca ggcgaggacg 2100 tggcggtgtt cgcgcgcggc ccgcaggcgc acctggttca cggcgtgcag gagcagacct 2160 tcatagcgca cgtcatggcc ttcgccgcct gcctggagcc ctacaccgcc tgcgacctgg 2220 cgccccccgc cggcaccacc gacgccgcgc acccgggtta ctctagagtc ggggcggccg 2280 gccgcttcga gcagacatct cccgggaatc cgcggctgca ggtcgacgaa caaaaactca 2340 tctcagaaga ggatctgaat gctgtgggcc aggacacgca ggaggtcatc gtggtgccac 2400 actccttgcc ctttaaggtg gtggtgatct cagccatcct ggccctggtg gtgctcacca 2460 tcatctccct tatcatcctc atcatgcttt ggcagaagaa gccacgttag gcggccgctc 2520 gagatcagct agagggcccg tttaaacccg ctgatcagcc tcgactgtgc cttctagttg 2580 ccagccatct gttgtttgcc cctcccccgt gccttccttg accctggaag gtgccactcc 2640 cactgtcctt tcctaataaa atgaggaaat tgcatcgcat tgtctgagta ggtgtcattc 2700 tattctgggg ggtggggtgg ggcaggacag caagggggag gattgggaag acaatagcag 2760 gcatgctggg gatgcggtgg gctctatggc ttctgaggcg gaaagaacca gctggggctc 2820 tagggggtat ccccacgcgc cctgtagcgg cgcattaagc gcggcgggtg tggtggttac 2880 gcgcagcgtg accgctacac ttgccagcgc cctagcgccc gctcctttcg ctttcttccc 2940 ttcctttctc gccacgttcg ccggctttcc ccgtcaagct ctaaatcggg gcatcccttt 3000 agggttccga tttagtgctt tacggcacct cgaccccaaa aaacttgatt agggtgatgg 3060 ttcacgtagt gggccatcgc cctgatagac ggtttttcgc cctttgacgt tggagtccac 3120 gttctttaat agtggactct tgttccaaac tggaacaaca ctcaacccta tctcggtcta 3180 ttcttttgat ttataaggga ttttggggat ttcggcctat tggttaaaaa atgagctgat 3240 ttaacaaaaa tttaacgcga attaattctg tggaatgtgt gtcagttagg gtgtggaaag 3300 tccccaggct ccccaggcag gcagaagtat gcaaagcatg catctcaatt agtcagcaac 3360 caggtgtgga aagtccccag gctccccagc aggcagaagt atgcaaagca tgcatctcaa 3420 ttagtcagca accatagtcc cgcccctaac tccgcccatc ccgcccctaa ctccgcccag 3480 ttccgcccat tctccgcccc atggctgact aatttttttt atttatgcag aggccgaggc 3540 cgcctctgcc tctgagctat tccagaagta gtgaggaggc ttttttggag gcctaggctt 3600 ttgcaaaaag ctcccgggag cttgtatatc cattttcgga tctgatcaag agacaggatg 3660 aggatcgttt cgcatgattg aacaagatgg attgcacgca ggttctccgg ccgcttgggt 3720 ggagaggcta ttcggctatg actgggcaca acagacaatc ggctgctctg atgccgccgt 3780 gttccggctg tcagcgcagg ggcgcccggt tctttttgtc aagaccgacc tgtccggtgc 3840 cctgaatgaa ctgcaggacg aggcagcgcg gctatcgtgg ctggccacga cgggcgttcc 3900 ttgcgcagct gtgctcgacg ttgtcactga agcgggaagg gactggctgc tattgggcga 3960 agtgccgggg caggatctcc tgtcatctca ccttgctcct gccgagaaag tatccatcat 4020 ggctgatgca atgcggcggc tgcatacgct tgatccggct acctgcccat tcgaccacca 4080 agcgaaacat cgcatcgagc gagcacgtac tcggatggaa gccggtcttg tcgatcagga 4140 tgatctggac gaagagcatc aggggctcgc gccagccgaa ctgttcgcca ggctcaaggc 4200 gcgcatgccc gacggcgagg atctcgtcgt gacccatggc gatgcctgct tgccgaatat 4260 catggtggaa aatggccgct tttctggatt catcgactgt ggccggctgg gtgtggcgga 4320 ccgctatcag gacatagcgt tggctacccg tgatattgct gaagagcttg gcggcgaatg 4380 ggctgaccgc ttcctcgtgc tttacggtat cgccgctccc gattcgcagc gcatcgcctt 4440 ctatcgcctt cttgacgagt tcttctgagc gggactctgg ggttcgaaat gaccgaccaa 4500 gcgacgccca acctgccatc acgagatttc gattccaccg ccgccttcta tgaaaggttg 4560 ggcttcggaa tcgttttccg ggacgccggc tggatgatcc tccagcgcgg ggatctcatg 4620 ctggagttct tcgcccaccc caacttgttt attgcagctt ataatggtta caaataaagc 4680 aatagcatca caaatttcac aaataaagca tttttttcac tgcattctag ttgtggtttg 4740 tccaaactca tcaatgtatc ttatcatgtc tgtataccgt cgacctctag ctagagcttg 4800 gcgtaatcat ggtcatagct gtttcctgtg tgaaattgtt atccgctcac aattccacac 4860 aacatacgag ccggaagcat aaagtgtaaa gcctggggtg cctaatgagt gagctaactc 4920 acattaattg cgttgcgctc actgcccgct ttccagtcgg gaaacctgtc gtgccagctg 4980 cattaatgaa tcggccaacg cgcggggaga ggcggtttgc gtattgggcg ctcttccgct 5040 tcctcgctca ctgactcgct gcgctcggtc gttcggctgc ggcgagcggt atcagctcac 5100 tcaaaggcgg taatacggtt atccacagaa tcaggggata acgcaggaaa gaacatgtga 5160 gcaaaaggcc agcaaaaggc caggaaccgt aaaaaggccg cgttgctggc gtttttccat 5220 aggctccgcc cccctgacga gcatcacaaa aatcgacgct caagtcagag gtggcgaaac 5280 ccgacaggac tataaagata ccaggcgttt ccccctggaa gctccctcgt gcgctctcct 5340 gttccgaccc tgccgcttac cggatacctg tccgcctttc tcccttcggg aagcgtggcg 5400 ctttctcaat gctcacgctg taggtatctc agttcggtgt aggtcgttcg ctccaagctg 5460 ggctgtgtgc acgaaccccc cgttcagccc gaccgctgcg ccttatccgg taactatcgt 5520 cttgagtcca acccggtaag acacgactta tcgccactgg cagcagccac tggtaacagg 5580 attagcagag cgaggtatgt aggcggtgct acagagttct tgaagtggtg gcctaactac 5640 ggctacacta gaaggacagt atttggtatc tgcgctctgc tgaagccagt taccttcgga 5700 aaaagagttg gtagctcttg atccggcaaa caaaccaccg ctggtagcgg tggttttttt 5760 gtttgcaagc agcagattac gcgcagaaaa aaaggatctc aagaagatcc tttgatcttt 5820 tctacggggt ctgacgctca gtggaacgaa aactcacgtt aagggatttt ggtcatgaga 5880 ttatcaaaaa ggatcttcac ctagatcctt ttaaattaaa aatgaagttt taaatcaatc 5940 taaagtatat atgagtaaac ttggtctgac agttaccaat gcttaatcag tgaggcacct 6000 atctcagcga tctgtctatt tcgttcatcc atagttgcct gactccccgt cgtgtagata 6060 actacgatac gggagggctt accatctggc cccagtgctg caatgatacc gcgagaccca 6120 cgctcaccgg ctccagattt atcagcaata aaccagccag ccggaagggc cgagcgcaga 6180 agtggtcctg caactttatc cgcctccatc cagtctatta attgttgccg ggaagctaga 6240 gtaagtagtt cgccagttaa tagtttgcgc aacgttgttg ccattgctac aggcatcgtg 6300 gtgtcacgct cgtcgtttgg tatggcttca ttcagctccg gttcccaacg atcaaggcga 6360 gttacatgat cccccatgtt gtgcaaaaaa gcggttagct ccttcggtcc tccgatcgtt 6420 gtcagaagta agttggccgc agtgttatca ctcatggtta tggcagcact gcataattct 6480 cttactgtca tgccatccgt aagatgcttt tctgtgactg gtgagtactc aaccaagtca 6540 ttctgagaat agtgtatgcg gcgaccgagt tgctcttgcc cggcgtcaat acgggataat 6600 accgcgccac atagcagaac tttaaaagtg ctcatcattg gaaaacgttc ttcggggcga 6660 aaactctcaa ggatcttacc gctgttgaga tccagttcga tgtaacccac tcgtgcaccc 6720 aactgatctt cagcatcttt tactttcacc agcgtttctg ggtgagcaaa aacaggaagg 6780 caaaatgccg caaaaaaggg aataagggcg acacggaaat gttgaatact catactcttc 6840 ctttttcaat attattgaag catttatcag ggttattgtc tcatgagcgg atacatattt 6900 gaatgtattt agaaaaataa acaaataggg gttccgcgca catttccccg aaaagtgcca 6960 cctgacgtcg acggatcggg 6980 8 8750 DNA pFastFind-JNK3 8 agatctcggc cgcatattaa gtgcattgtt ctcgataccg ctaagtgcat tgttctcgtt 60 agctcgatgg acaagtgcat tgttctcttg ctgaaagctc gatggacaag tgcattgttc 120 tcttgctgaa agctcgatgg acaagtgcat tgttctcttg ctgaaagctc agtacccggg 180 agtaccctcg accgccggag tataaataga ggcgcttcgt ctacggagcg acaattcaat 240 tcaaacaagc aaagtgaaca cgtcgctaag cgaaagctaa gcaaataaac aagcgcagct 300 gaacaagcta aacaatctgc agtaaagtgc aagttaaagt gaatcaatta aaagtaacca 360 gcaaccaagt aaatcaactg caactactga aatctgccaa gaagtaatta ttgaatacaa 420 gaagagaact ctgaatactt tcaacaagtt accgagaaag aagaactcac acacagctag 480 cgtttaaact taagcttggt accgagctcg gatccactag tacaaccatg gtgagcctcc 540 atttcttata ctactgcagt gaaccaacat tggatgtgaa aattgccttt tgtcagggat 600 tcgataaaca agtggatgtg tcatatattg ccaaacatta caacatgagc aaaagcaaag 660 ttgacaacca gttctacagt gtggaagtgg gagactcaac cttcacagtt ctcaagcgct 720 accagaatct aaagcctatt ggctctgggg ctcagggcat agtttgtgcc gcgtatgatg 780 ctgtccttga cagaaatgtg gccattaaga agctcagcag accctttcag aaccaaacac 840 atgccaagag agcgtaccgg gagctggtcc tcatgaagtg tgtgaaccat aaaaacatta 900 ttagtttatt aaatgtcttc acaccccaga aaacgctgga ggagttccaa gatgtttact 960 tagtaatgga actgatggat gccaacttat gtcaagtgat tcagatggaa ttagaccatg 1020 agcgaatgtc ttacctgctg taccaaatgt tgtgtggcat taagcacctc cattctgctg 1080 gaattattca cagggattta aaaccaagta acattgtagt caagtctgat tgcacattga 1140 aaatcctgga ctttggactg gccaggacag caggcacaag cttcatgatg actccatatg 1200 tggtgacacg ttattacaga gcccctgagg tcatcctggg gatgggctgc aaggagaacg 1260 tggatatatg gtctgtggga tgcattatgg gagaaatggt tcgccacaaa atcctctttc 1320 caggaaggga ctatattgac cagtggaata aggtaattga acaactagga acaccatgtc 1380 cagaattcat gaagaaattg caacccacag taagaaacta tgtggagaat cggcccaagt 1440 atgcgggact caccttcccc aaactcttcc cagattccct cttcccagcg gactccgagc 1500 acaataaact caaagccagc caagccaggg acttgttgtc aaagatgcta gtgattgacc 1560 cagcaaaaag aatatcagtg gacgacgcct tacagcatcc ctacatcaac gtctggtatg 1620 acccagccga agtggaggcg cctccacctc agatatatga caagcagttg gatgaaagag 1680 aacacacaat tgaagaatgg aaagaactta tctacaagga agtaatgaat tcagaagaaa 1740 agactaaaaa tggtgtagta aaaggacagc cttctccttc agcacaggtg cagcagtgag 1800 actacaagga cgatgatgac gccgatatcc agcacagtgg cggccgctcg agccaattcc 1860 gcccctctcc ctcccccccc cctaacgtta ctggccgaag ccgcttggaa taaggccggt 1920 gtgcgtttgt ctatatgtga ttttccacca tattgccgtc ttttggcaat gtgagggccc 1980 ggaaacctgg ccctgtcttc ttgacgagca ttcctagggg tctttcccct ctcgccaaag 2040 gaatgcaagg tctgttgaat gtcgtgaagg aagcagttcc tctggaagct tcttgaagac 2100 aaacaacgtc tgtagcgacc ctttgcaggc agcggaaccc cccacctggc gacaggtgcc 2160 tctgcggcca aaagccacgt gtataagata cacctgcaaa ggcggcacaa ccccagtgcc 2220 acgttgtgag ttggatagtt gtggaaagag tcaaatggct ctcctcaagc gtattcaaca 2280 aggggctgaa ggatgcccag aaggtacccc attgtatggg atctgatctg gggcctcggt 2340 gcacatgctt tacatgtgtt tagtcgaggt taaaaaaacg tctaggcccc ccgaaccacg 2400 gggacgtggt tttcctttga aaaacacgat gataagcttg ccacaacccg gtctagcccg 2460 ggctcgagat ctgcgatcta agtaagcttc gaatcgcgaa ttcgcccacc atgctgctgc 2520 tgctgctgct gctgggcctg aggctacagc tctccctggg catcatccca gttgaggagg 2580 agaacccgga cttctggaac cgcgaggcag ccgaggccct gggtgccgcc aagaagctgc 2640 agcctgcaca gacagccgcc aagaacctca tcatcttcct gggcgatggg atgggggtgt 2700 ctacggtgac agctgccagg atcctaaaag ggcagaagaa ggacaaactg gggcctgaga 2760 tacccctggc catggaccgc ttcccatatg tggctctgtc caagacatac aatgtagaca 2820 aacatgtgcc agacagtgga gccacagcca cggcctacct gtgcggggtc aagggcaact 2880 tccagaccat tggcttgagt gcagccgccc gctttaacca gtgcaacacg acacgcggca 2940 acgaggtcat ctccgtgatg aatcgggcca agaaagcagg gaagtcagtg ggagtggtaa 3000 ccaccacacg agtgcagcac gcctcgccag ccggcaccta cgcccacacg gtgaaccgca 3060 actggtactc ggacgccgac gtgcctgcct cggcccgcca ggaggggtgc caggacatcg 3120 ctacgcagct catctccaac atggacattg acgtgatcct aggtggaggc cgaaagtaca 3180 tgtttcgcat gggaacccca gaccctgagt acccagatga ctacagccaa ggtgggacca 3240 ggctggacgg gaagaatctg gtgcaggaat ggctggcgaa gcgccagggt gcccggtatg 3300 tgtggaaccg cactgagctc atgcaggctt ccctggaccc gtctgtgacc catctcatgg 3360 gtctctttga gcctggagac atgaaatacg agatccaccg agactccaca ctggacccct 3420 ccctgatgga gatgacagag gctgccctgc gcctgctgag caggaacccc cgcggcttct 3480 tcctcttcgt ggagggtggt cgcatcgacc atggtcatca tgaaagcagg gcttaccggg 3540 cactgactga gacgatcatg ttcgacgacg ccattgagag ggcgggccag ctcaccagcg 3600 aggaggacac gctgagcctc gtcactgccg accactccca cgtcttctcc ttcggaggct 3660 accccctgcg agggagctcc atcttcgggc tggcccctgg caaggcccgg gacaggaagg 3720 cctacacggt cctcctatac ggaaacggtc caggctatgt gctcaaggac ggcgcccggc 3780 cggatgttac cgagagcgag agcgggagcc ccgagtatcg gcagcagtca gcagtgcccc 3840 tggacgaaga gacccacgca ggcgaggacg tggcggtgtt cgcgcgcggc ccgcaggcgc 3900 acctggttca cggcgtgcag gagcagacct tcatagcgca cgtcatggcc ttcgccgcct 3960 gcctggagcc ctacaccgcc tgcgacctgg cgccccccgc cggcaccacc gacgccgcgc 4020 acccgggtta ctctagagtc ggggcggccg gccgcttcga gcagacatct cccgggaatc 4080 cgcggctgca ggtcgacgaa caaaaactca tctcagaaga ggatctgaat gctgtgggcc 4140 aggacacgca ggaggtcatc gtggtgccac actccttgcc ctttaaggtg gtggtgatct 4200 cagccatcct ggccctggtg gtgctcacca tcatctccct tatcatcctc atcatgcttt 4260 ggcagaagaa gccacgttag gcggccgctc gagatcagct agagggcccg tttaaacccg 4320 ctgatcagcc tcgactgtgc cttctagttg ccagccatct gttgtttgcc cctcccccgt 4380 gccttccttg accctggaag gtgccactcc cactgtcctt tcctaataaa atgaggaaat 4440 tgcatcgcat tgtctgagta ggtgtcattc tattctgggg ggtggggtgg ggcaggacag 4500 caagggggag gattgggaag acaatagcag gcatgctggg gatgcggtgg gctctatggc 4560 ttctgaggcg gaaagaacca gctggggctc tagggggtat ccccacgcgc cctgtagcgg 4620 cgcattaagc gcggcgggtg tggtggttac gcgcagcgtg accgctacac ttgccagcgc 4680 cctagcgccc gctcctttcg ctttcttccc ttcctttctc gccacgttcg ccggctttcc 4740 ccgtcaagct ctaaatcggg gcatcccttt agggttccga tttagtgctt tacggcacct 4800 cgaccccaaa aaacttgatt agggtgatgg ttcacgtagt gggccatcgc cctgatagac 4860 ggtttttcgc cctttgacgt tggagtccac gttctttaat agtggactct tgttccaaac 4920 tggaacaaca ctcaacccta tctcggtcta ttcttttgat ttataaggga ttttggggat 4980 ttcggcctat tggttaaaaa atgagctgat ttaacaaaaa tttaacgcga attaattctg 5040 tggaatgtgt gtcagttagg gtgtggaaag tccccaggct ccccaggcag gcagaagtat 5100 gcaaagcatg catctcaatt agtcagcaac caggtgtgga aagtccccag gctccccagc 5160 aggcagaagt atgcaaagca tgcatctcaa ttagtcagca accatagtcc cgcccctaac 5220 tccgcccatc ccgcccctaa ctccgcccag ttccgcccat tctccgcccc atggctgact 5280 aatttttttt atttatgcag aggccgaggc cgcctctgcc tctgagctat tccagaagta 5340 gtgaggaggc ttttttggag gcctaggctt ttgcaaaaag ctcccgggag cttgtatatc 5400 cattttcgga tctgatcaag agacaggatg aggatcgttt cgcatgattg aacaagatgg 5460 attgcacgca ggttctccgg ccgcttgggt ggagaggcta ttcggctatg actgggcaca 5520 acagacaatc ggctgctctg atgccgccgt gttccggctg tcagcgcagg ggcgcccggt 5580 tctttttgtc aagaccgacc tgtccggtgc cctgaatgaa ctgcaggacg aggcagcgcg 5640 gctatcgtgg ctggccacga cgggcgttcc ttgcgcagct gtgctcgacg ttgtcactga 5700 agcgggaagg gactggctgc tattgggcga agtgccgggg caggatctcc tgtcatctca 5760 ccttgctcct gccgagaaag tatccatcat ggctgatgca atgcggcggc tgcatacgct 5820 tgatccggct acctgcccat tcgaccacca agcgaaacat cgcatcgagc gagcacgtac 5880 tcggatggaa gccggtcttg tcgatcagga tgatctggac gaagagcatc aggggctcgc 5940 gccagccgaa ctgttcgcca ggctcaaggc gcgcatgccc gacggcgagg atctcgtcgt 6000 gacccatggc gatgcctgct tgccgaatat catggtggaa aatggccgct tttctggatt 6060 catcgactgt ggccggctgg gtgtggcgga ccgctatcag gacatagcgt tggctacccg 6120 tgatattgct gaagagcttg gcggcgaatg ggctgaccgc ttcctcgtgc tttacggtat 6180 cgccgctccc gattcgcagc gcatcgcctt ctatcgcctt cttgacgagt tcttctgagc 6240 gggactctgg ggttcgaaat gaccgaccaa gcgacgccca acctgccatc acgagatttc 6300 gattccaccg ccgccttcta tgaaaggttg ggcttcggaa tcgttttccg ggacgccggc 6360 tggatgatcc tccagcgcgg ggatctcatg ctggagttct tcgcccaccc caacttgttt 6420 attgcagctt ataatggtta caaataaagc aatagcatca caaatttcac aaataaagca 6480 tttttttcac tgcattctag ttgtggtttg tccaaactca tcaatgtatc ttatcatgtc 6540 tgtataccgt cgacctctag ctagagcttg gcgtaatcat ggtcatagct gtttcctgtg 6600 tgaaattgtt atccgctcac aattccacac aacatacgag ccggaagcat aaagtgtaaa 6660 gcctggggtg cctaatgagt gagctaactc acattaattg cgttgcgctc actgcccgct 6720 ttccagtcgg gaaacctgtc gtgccagctg cattaatgaa tcggccaacg cgcggggaga 6780 ggcggtttgc gtattgggcg ctcttccgct tcctcgctca ctgactcgct gcgctcggtc 6840 gttcggctgc ggcgagcggt atcagctcac tcaaaggcgg taatacggtt atccacagaa 6900 tcaggggata acgcaggaaa gaacatgtga gcaaaaggcc agcaaaaggc caggaaccgt 6960 aaaaaggccg cgttgctggc gtttttccat aggctccgcc cccctgacga gcatcacaaa 7020 aatcgacgct caagtcagag gtggcgaaac ccgacaggac tataaagata ccaggcgttt 7080 ccccctggaa gctccctcgt gcgctctcct gttccgaccc tgccgcttac cggatacctg 7140 tccgcctttc tcccttcggg aagcgtggcg ctttctcaat gctcacgctg taggtatctc 7200 agttcggtgt aggtcgttcg ctccaagctg ggctgtgtgc acgaaccccc cgttcagccc 7260 gaccgctgcg ccttatccgg taactatcgt cttgagtcca acccggtaag acacgactta 7320 tcgccactgg cagcagccac tggtaacagg attagcagag cgaggtatgt aggcggtgct 7380 acagagttct tgaagtggtg gcctaactac ggctacacta gaaggacagt atttggtatc 7440 tgcgctctgc tgaagccagt taccttcgga aaaagagttg gtagctcttg atccggcaaa 7500 caaaccaccg ctggtagcgg tggttttttt gtttgcaagc agcagattac gcgcagaaaa 7560 aaaggatctc aagaagatcc tttgatcttt tctacggggt ctgacgctca gtggaacgaa 7620 aactcacgtt aagggatttt ggtcatgaga ttatcaaaaa ggatcttcac ctagatcctt 7680 ttaaattaaa aatgaagttt taaatcaatc taaagtatat atgagtaaac ttggtctgac 7740 agttaccaat gcttaatcag tgaggcacct atctcagcga tctgtctatt tcgttcatcc 7800 atagttgcct gactccccgt cgtgtagata actacgatac gggagggctt accatctggc 7860 cccagtgctg caatgatacc gcgagaccca cgctcaccgg ctccagattt atcagcaata 7920 aaccagccag ccggaagggc cgagcgcaga agtggtcctg caactttatc cgcctccatc 7980 cagtctatta attgttgccg ggaagctaga gtaagtagtt cgccagttaa tagtttgcgc 8040 aacgttgttg ccattgctac aggcatcgtg gtgtcacgct cgtcgtttgg tatggcttca 8100 ttcagctccg gttcccaacg atcaaggcga gttacatgat cccccatgtt gtgcaaaaaa 8160 gcggttagct ccttcggtcc tccgatcgtt gtcagaagta agttggccgc agtgttatca 8220 ctcatggtta tggcagcact gcataattct cttactgtca tgccatccgt aagatgcttt 8280 tctgtgactg gtgagtactc aaccaagtca ttctgagaat agtgtatgcg gcgaccgagt 8340 tgctcttgcc cggcgtcaat acgggataat accgcgccac atagcagaac tttaaaagtg 8400 ctcatcattg gaaaacgttc ttcggggcga aaactctcaa ggatcttacc gctgttgaga 8460 tccagttcga tgtaacccac tcgtgcaccc aactgatctt cagcatcttt tactttcacc 8520 agcgtttctg ggtgagcaaa aacaggaagg caaaatgccg caaaaaaggg aataagggcg 8580 acacggaaat gttgaatact catactcttc ctttttcaat attattgaag catttatcag 8640 ggttattgtc tcatgagcgg atacatattt gaatgtattt agaaaaataa acaaataggg 8700 gttccgcgca catttccccg aaaagtgcca cctgacgtcg acggatcggg 8750 

What is claimed:
 1. A polynucleotide, comprising: a regulatable promoter; a test gene; an IRES sequence; and a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker.
 2. The polynucleotide of claim 1, wherein said surface marker does not exhibit enzymatic activity.
 3. The polynucleotide of claim 1, further comprising a selectable marker.
 4. The polynucleotide of claim 1, further comprising a heterologous origin of replication.
 5. A host cell, comprising: a polynucleotide, said polynucleotide comprising a regulatable promoter, a test gene, an IRES sequence, a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker.
 6. The host cell of claim 5, wherein said test gene comprises a heterologous DNA sequence.
 7. The host cell of claim 5, wherein said promoter is native to said host cell.
 8. The host cell of claim 5, wherein said host cell is selected from the group consisting of yeast and mammalian cells.
 9. A method of identifying a host cell that exhibits regulated expression of a test gene, comprising: a) providing a plurality of host cells, each host cell comprising a polynucleotide, said polynucleotide comprising in order a regulatable promoter; a test gene; an IRES sequence; and a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker; b) inducing said promoter; and c) selecting a host cell that displays said surface marker on its surface.
 10. The method of claim 9, further comprising: d) repressing said promoter; and e) selecting a host cell that no longer displays said surface marker on its surface.
 11. The method of claim 9, wherein said host cell is selected by fluorescence-activated cell sorting.
 12. A method of identifying a host cell that exhibits regulated expression of a test gene, comprising: a) providing a plurality of host cells, each host cell comprising a polynucleotide, said polynucleotide comprising in order a regulatable promoter; a test gene; an IRES sequence; and a surface marker coding sequence, said surface marker comprising a secretion signal sequence, a detectable label protein, and a membrane anchor; wherein expression of said test gene also results in expression of said surface marker; b) selecting a plurality of host cells that do not exhibit said surface marker in the absence of induction of said promoter; c) inducing said promoter; and d) selecting a host cell that exhibits expression of said surface marker.
 13. The method of claim 12, wherein said host cell is selected by fluorescence-activated cell sorting. 